From Kuwait west to Lisbon in all
North from Aswan to Hadrian’s Wall
This was Trajan’s domain
As he’d good emp’ror reign
O’er a Rome at its very least small

Event: Trajan becomes Emperor of Rome. Under his rule, the Roman Empire would reach the largest extent in its history, covering nearly 2 million square miles and including roughly a third of the population of Earth.
Year: 98
Learn more: TrajanList of largest empires